A Maltese investigative journalist who exposed the island nation's links to offshore tax havens through the leaked Panama Papers was killed Monday when a bomb exploded in her car, the prime minister said.

A Maltese investigative journalist who exposed the island nation's links to offshore tax havens through the leaked Panama Papers was killed Monday when a bomb exploded in her car, the prime minister said.

Alec Baldwin has reprised in his role as Donald Trump for the latest episode of Saturday Night Live’s Weekend Update, identifying the US president as the true martyr of the tragic Charlottesville rally.

When a fairly innocuous question about autopsy results in passports being confiscated and extra police being assigned to your hotel, you can’t help but wonder what the hell is going to happen, reporter Pete Stefanovic tells.

Stockholm attack: Police say suspect had interest in Islamic State

Swedish authorities have identified the suspect in Stockholm's deadly beer truck attack as a 39-year-old native of Uzbekistan who was previously on their radar.

Police said he had shown interest in extremist groups and had his permanent residency application rejected in June 2016.

We know that he showed interest for extremist organisations like IS," police chief Jonas Hysing told reporters, adding that two Swedes, one Briton and a Belgian were killed in the attack.

The suspect, who has only been officially identified as a 39-year-old man from Uzbekistan, "applied for a permanent residency permit in 2014", Mr Hysing said.

"The Migration Agency rejected it in June 2016 and also decided that he was to be expelled," he added.

"In December 2016, he was informed by the Migration Agency that he had four weeks to leave the country. In February 2017, the case was handed over to the police to carry out the order, since the person had gone underground," he said.

But police apparently never found the man.

Police also said they are investigating something found in the truck that "could be a bomb or an incendiary object".

Meanwhile Sweden's health service has confirmed 10 people were still hospitalised for wounds from the attack and four of them were seriously injured.

Swedish Prime Minister Stefan Lofven has declared Monday a national day of mourning, with a minute of silence at noon.

Yesterday he indicated to a press conference that the rampage was terror-motivated.

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"Sweden has been attacked. Everything points to the fact that this is a terrorist attack," Mr Lofven said.

Glen Foran, an Australian tourist in his 40s who witnessed the attack, told Reuters he believes the truck was deliberately targetting shoppers as it barrelled down the bustling Drottninggatan pedestrian street before, smashing into the facade of the Ahlens department store.

"I turned around and saw a big truck coming towards me. It swerved from side to side. It didn't look out of control, it was trying to hit people," he said.

"It hit people, it was terrible. It hit a pram with a kid in it, demolished it.

"It took a long time for police to get here. I suppose from their view it was quick, but it felt like forever."

The attack saw part of central Stockholm cordoned off and the affected area evacuated, including the main train station. All subway traffic was halted on orders from the police.

The Swedish news agency TT reported that the Swedish brewery company Spendrups, which owns the truck used in the attack, said the vehicle had been hijacked earlier in the day.

"During a delivery to the restaurant Caliente someone jumped into the driver's cabin and drove off with the car while the driver unload(ed)," communications director Mårten Lyth said.

Swedish police have released photos of a man wanted in connection with the attack. (Supplied)

Previously police confirmed they had arrested a man in a Northern Stockholm suburb and earlier said they were interviewing two people in relation to the attack.

Prior attacks using vehicles have occurred in London, Berlin and the southern French city of Nice, all of them claimed by ISIS.

There has been no immediate claim of responsibility for the Stockholm attack, the third terror attack in Europe in two weeks, coming on the heels of assaults in London and Saint Petersburg.